如何用get方post方式向http接口发送数据

Posted 2023-03-14

参考技术A 1. 项目环境如下：
myeclipse6.5 、tomcat5.0、system:xp、JDK:开发1.5，编译1.4
为了方便,在原来的web项目UpDown中新建了一个httpcall包，用来保存http接口和调用的客户端。

2.准备需要的jar包
* commons-httpclient-3.0.jar
* commons-logging.jar
* commons-codec-1.3.jar

3.class&method
HttpClient：
GetMethod：
PostMethod：

start
接口写了一个servlet来接收客户端get/post的请求
web.xml需要加入以下配置：
<!-- 模拟HTTP的调用，写的一个http接口 -->
<servlet>
<servlet-name>TestHTTPServer</servlet-name>
<servlet-class>httpcall.TestHTTPServer</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestHTTPServer</servlet-name>
<url-pattern>/httpServer</url-pattern>
</servlet-mapping>

TestHTTPServer.java的代码如下:

TestHTTPServer
1 package httpcall;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5 import javax.servlet.ServletException;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 /**
11 *Module: TestHTTPServer.java
12 *Description: 为了验证http接口的调用，编写了一个模拟的http接口
13 *Company:
14 *Author: ptp
15 *Date: Feb 22, 2012
16 */
17
18 public class TestHTTPServer extends HttpServlet
19
20 private static final long serialVersionUID = 1L;
22 public void doGet(HttpServletRequest request, HttpServletResponse response)
23 throws ServletException, IOException
24 response.setCharacterEncoding("gbk");
25
26 PrintWriter out = response.getWriter();
27 String param1 = request.getParameter("param1");
28 out.println("param1=" + param1);
29 String param2 = request.getParameter("param2");
30 out.println("param2=" + param2);
31 if (param1 == null || "".equals("param1") || param1.length() <= 0) 32 out.println("http call failed,参数param1不能为空,程序退出"); 33 else if (param2 == null || "".equals("param2")
34 || param2.length() <= 0)
35 out.println("http call failed,参数param2不能为空,程序退出"); 36 else
37 out.println("---http call success---");
38
39 out.close();
40
41
42 public void doPost(HttpServletRequest request, HttpServletResponse response)
43 throws ServletException, IOException
44 this.doGet(request, response);
45
46

HttpClientUtil.java的代码如下：
HttpClientUtil
1 package httpcall;
3 import java.io.IOException;
4 import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; 5 //import org.apache.commons.httpclient.Header;
6 import org.apache.commons.httpclient.HttpClient;
7 import org.apache.commons.httpclient.HttpException;
8 //import org.apache.commons.httpclient.HttpStatus;
9 import org.apache.commons.httpclient.methods.GetMethod;
10 import org.apache.commons.httpclient.methods.PostMethod;
11 import org.apache.commons.httpclient.params.HttpMethodParams;
12 //import org.apache.commons.httpclient.NameValuePair;
13 import org.apache.commons.logging.Log;
14 import org.apache.commons.logging.LogFactory;
15
16 /**
17 *
18 *Module: HttpClientUtil.java
19 *Description: 以get/post的方式发送数据到指定的http接口---利用httpclient.jar包---HTTP接口的调用
20 *Company:
21 *Author: ptp
22 *Date: Feb 22, 2012
23 */
24
25 public class HttpClientUtil
26
27 private static final Log log = LogFactory
28 .getLog(HttpClientUtil.class);
29
30 /**
31 * get方式
32 * @param param1
33 * @param param2
34 * @return
35 */
36 public static String getHttp(String param1,String param2)
37 String responseMsg = "";
38
39 // 1.构造HttpClient的实例
40 HttpClient httpClient = new HttpClient();
41
42 // 用于测试的http接口的url
43 String url="http://localhost:8080/UpDown/httpServer?param1="+param1+"¶m2="+param2; 44
45 // 2.创建GetMethod的实例
46 GetMethod getMethod = new GetMethod(url);
47
48 // 使用系统系统的默认的恢复策略
49 getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 50 new DefaultHttpMethodRetryHandler());
51
52 try
53 //3.执行getMethod,调用http接口
54 httpClient.executeMethod(getMethod);
55
56 //4.读取内容
57 byte[] responseBody = getMethod.getResponseBody();
58
59 //5.处理返回的内容
60 responseMsg = new String(responseBody);
61 log.info(responseMsg);
62
63 catch (HttpException e)
64 e.printStackTrace();
65 catch (IOException e)